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SERVICE SECTION
CHAPTER 3 - TROUBLESHOOTING
Problem
Possible
causes
Corrective Action
Connection
Problem
Warning:
Before checking connection, be sure disconnect main plug.
1. Check for any loose or bad connection between relay board, fluorescent lamp
ballast and female connector B on the electrical box. Use fingers to pull and check
cable tightness.
2. Find out terminal J13 on relay board, use finger to check tightness of 2 cables
connected to J13.
3. Find out connector B. Check and repair for any bad connection.
4. Check also connection on the lamp holder.
Faulty tube
Replace the faulty tube.
Faulty
Fluorescent
ballast
Switch on the unit. Press light button. Check AC voltage at ballast input (between pin
NO on J13 terminal on relay board to neutral). It should be either 230Vac or 115Vac
+/- 10%. If not, check the connection.
Switch off the unit, disconnect connector B on electrical panel, switch on the unit and
press light button, then check AC voltage at ballast output (between pin B1 and B2), it
should be around 450-600Vac.
Low building
supply voltage
Using multimeter, measure AC voltage at the motor voltage sampling port as
described in the re-certification section of this manual. This is to measure the blower’s
supply voltage.
If the supply voltage is lower than the Nominal Voltage value recorded in test report,
adjust the speed control to get blower’s output voltage as specified in the Test Report
– Test Conditions Documentation Sheet.
Fluctuating
Voltage
If the building supply voltage fluctuates more than the stated tolerance (+/- 2%),
connect the cabinet to a voltage stabilizer.
External air
interference
Ensure that there are no external sources of airflow disturbance like air conditioner
vent, window or incidences of door opening or people walking fast near the cabinet.
Blocked cabinet
grille
Ensure that the front and back air grilles inside the cabinet are not blocked and that
the cabinet is not excessively loaded.
Sensor Failure /
Sensor
Misalignment
Air Flow Sensor failure / misalignment
Check the sensor connection.
Important:
Ensure that the sensor is not blocked at all and that its through-hole is
perpendicular to the filter’s surface.
Using multimeter, check the sensor’s output voltage at channel AIN1 and J1 on main
board. The voltage should increase with increase in airflow. Replace the sensor if
your observation is otherwise.
Temperature Sensor Failure
Check the sensor connection.
Using multimeter, check the sensor’s output voltage at channel AIN4 and J4 on main
board. 0.01VDC should represent one degree Celsius. Replace temperature sensor if
your observation is different.
Airflow Failure -
alarm is
triggered (this
could be due to
either hardware
or software)
Motor failure
Check the motor. If motor is not running, refer to ‘motor silent’ section.
68
Summary of Contents for ASCENT OPTI BASIC
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